Um, no. You're just looking more and more unintelligent. Peer reviewed scientific research beats your stories from the hood.
You're making broad generalizations and arbitrary assigning cause and affect based on the life story of a couple of nitwits you know. And since you apparently think that that is superior, there is no way to contradict you. I don't know your nitwit friends, since they are apparently the standard for this issue, I can't argue this topic with you.
I'll stick to my scientific research.
As for the 50% thing, that statistic is fairly common, google around you'll find lots of mentions, this one here says 83 million people.
http://parentingteens.about.com/cs/m...arijuana10.htm
This one says 50% of all baby boomers.
https://www.personalmd.com/news/a1998020508.shtml
PS, not everyone who smokes marijuana has a ****ty life, is dumb, or is unsuccessful. Anymore than not everyone who drinks alcohol is a deadbeat wifebeating alcoholic.
Ya sure, you know, maybe someone has a story about an alcoholic who let alcohol ruin his life, his job, his marriage. But then he went to AA and got clean and turned his life around. Does that anecdote, now matter how it is "served", mean that everyone who takes a drink of beer or wine has a problem, is irresponsible, is going to ruin their life? Etc etc etc?
I think not. A person of low quality is going to have a ****ty life regardless, and a person of high quality can have a great life no matter if they wanted to smoke, or drink, or both, maybe even at the same time.